Android 8.0 Oreo notification channel

안드로이드 8.0에서는 제약사항으로 인해 notification channel을 생성하여야만 notification을 보낼수가 있다.

아래는 channel 생성 예제이다.

class MainActivity : AppCompatActivity() {

    private fun createChannel() {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as android.app.NotificationManager

            val channelMessage = NotificationChannel("channel_id", "channel_name", android.app.NotificationManager.IMPORTANCE_DEFAULT)

            channelMessage.description = "channel description"

            channelMessage.enableLights(true)

            channelMessage.lightColor = Color.GREEN

            channelMessage.enableVibration(true)

            channelMessage.vibrationPattern = longArrayOf(100, 200, 100, 200)

            channelMessage.lockscreenVisibility = Notification.VISIBILITY_PRIVATE

            notificationManager.createNotificationChannel(channelMessage)

        }

    }

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        //createChannel()

        val extras = Bundle()

        extras.putString("title", "hello")

        extras.putString("message", "world")

        sendNotification(extras)

    }

    private fun sendNotification(extras: Bundle?) {

        Log.e("Jungsoo", "sendNotification")

        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        val intent = Intent(this, MainActivity::class.java)

        intent.replaceExtras(extras)

        Log.e("Jungsoo", "sendNotification intent size=$intent ${intent?.extras}")

        //PendingIntent.FLAG_UPDATE_CURRENT 추가

        //extras 전달을 위해서

        val pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)

        val content = extras?.getString("message")

        val title = extras?.getString("title")

        val builder = NotificationCompat.Builder(this, "channel_id")

        builder.setSmallIcon(R.mipmap.ic_launcher)

                .setContentText(content)

                .setContentTitle(title)

                .setContentIntent(pendingIntent)

        notificationManager.notify(3, builder.build())

    }

}